诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
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诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
(2m-n)/(m+2n)=5 ∴(m+2n)/(2m-n)=1/5 ∴3(2m-n)/m+2n-m+2n/2m-n+3 =3×(2m-n)/(m+2n)+(m+2n)/(2m-n)+3 =15+1/5+3 =18又1/5
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